<?php

// ...
// ...

use App\Events\ProjectCreated;
use App\Listeners\SendProjectCreatedNotification;

class EventServiceProvider extends ServiceProvider
{
    // ...
    // ...
    protected $listen = [
        Registered::class => [
            // ...
        ],
        ProjectCreated::class => [
            SendProjectCreatedNotification::class
        ]
    ];

    // ...
}